Like all synonyms, they have different shades of meaning, and each has a range of meanings that overlap partly with the others. "Strange" and "weird" could be considered synonyms. "Awkward" is different. "Strange" simply means unfamiliar, different from what is expected. It's the most basic of the three words. It does not necessarily carry any negative connotation. For example, when we are at a restaurant I always like to try strange new foods. The noun "a stranger" means "a person you haven't met," or "a person from another place." "Weird" is centered on the ideas of something being supernatural, uncanny, creepy, and mysterious. It always carries a faint idea that the speaker dislikes or is repelled by something. Nowadays the overtones may be faint, but they are there. A good example of the old, original, central meaning is the use of the phrase "the weird sisters" for the witches in Shakespeare's "Macbeth." They weren't weird because of their unusual dress, they were weird because they had magical powers. My wife ties her shoelaces in a different way from most people. I might say "My wife has a strange way of tying her shoelace" as a simple statement of fact. If I said "My wife has a weird way of tying her shoelaces," it expresses some distaste--I don't like the way she does it, it bothers me, I don't think it's the "right" way. "Awkward" emphasizes that something is clumsy, not smooth, difficult for others to deal with. It emphasize clumsiness, not difference. For example, at the ages of 12 or 13, when children are starting to physically change into adults, they are often awkward. Not "strange" because it is a normal and familiar process, not "weird" because there's nothing mysterious or uncanny about it, but awkward.

Wierd means very strange. strange: unusaul and surprising awkward has different meanings like: difficult; not relaxed or comfortable; difficult to do, use, deal with.